Bearing developments in the oil and gas industry
Bearing developments in the oil and gas industry
PRODUCT
Needle roller bearing clearance and the fatigue life of work
by：Waxing
2020-06-17
From theoretical clearance minus the bearing installed on the shaft or shell because of the interference fit within the ring of the expansion or contraction after the clearance called 'installation clearance'.
Add and subtract in installation clearance for bearing internal clearance after the size change from temperature difference is called 'effective clearance'.
Bearing installed with mechanical clearance when placed under certain load, the effective clearance and bearing load produced by the elastic deformation of so called 'work clearance'.
When work clearance for micro negative, the fatigue life of bearing the longest but with the increase of negative clearance with a significant reduction in fatigue life.
Therefore, choose the bearing clearance, general work clearance is zero or slightly is advisable.
Clearance and the fatigue life of work in addition, the need to improve the bearing rigidity or to reduce noise, further negative clearance to work, and when the bearing temperature rise drastically, work clearance should further positively and so on, also must make a concrete analysis according to the conditions of use.
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